DIGITAL BROADCAST RECEIVER AND INFORMATION UPDATING METHOD THEREFOR

摘要

A digital broadcast receiver on a mobile body includes: a tuner that receives a broadcast signal of a physical channel; a signal intensity detector that detects a signal intensity of the broadcast signal; a current position detector that detects a current position of the mobile body; a movement direction detector that detects a movement direction of the mobile body; a reception judging unit that controls the tuner to judge whether the physical channel can be received; an area information storage unit that stores receivable area information indicating a receivable area of the physical channel; and an area information updating unit that determines, when it is judged that the physical channel can be received, a position apart from the current position in the movement direction according to the signal intensity as a receivable position, and updates the receivable area information to extend the receivable area to the receivable position.

主权项

1. A digital broadcast receiver mounted on a mobile body, the digital broadcast receiver comprising:
a tuner configured to receive a broadcast signal of a physical channel transmitted by digital broadcasting; a signal intensity detector configured to detect a signal intensity of the broadcast signal received by the tuner; a current position detector configured to detect a current position of the mobile body; a movement direction detector configured to detect a movement direction of the mobile body; a reception judging unit configured to control the tuner to judge whether or not the physical channel can be received; an area information storage unit configured to store receivable area information indicating a receivable area of the physical channel; and an area information updating unit configured to determine, when the reception judging unit judges that the physical channel can be received, a position apart from the current position detected by the current position detector in the movement direction detected by the movement direction detector according to the signal intensity detected by the signal intensity detector as a receivable position, and update the receivable area information stored in the area information storage unit so as to extend the receivable area indicated by the receivable area information to the receivable position.